I tried making a change to cmd/go/internal/cache to replace uses of fmt.Sprintf("%02x", i) with hex.EncodeToString. You can view the change here: https://go-review.googlesource.com/c/go/+/258039

The change didn't work, which is fine. However, instead of giving me an error message or explaining what went wrong, run.bash and all.bash just hung for over an hour with no output on the Building Go toolchain2 using go_bootstrap and Go toolchain1 line, which you can see here as of Wednesday at 5:30pm Pacific. https://farmer.golang.org/try?commit=f4ae3966

In fact, most of the Trybot builders appear to be stuck for multiple hours on that step, which isn't great since there appears to be no way to cancel a Trybot build.

I would expect compilation to either succeed or fail with an error, or time out with an error, instead of hanging indefinitely. I still don't know what's wrong with the CL.